Sliding door device for vehicle

Abstract

A sliding door device includes a door arm including one end portion rotatably connected to one end portion of a door, and the other end portion movable along a side sill of the vehicle body, a lower slider coupled to the second end portion of the door arm and configured to be rectilinearly movable along the side sill of the vehicle body, a lower arm plate connecting the second end portion of the door arm and the lower slider and configured to perform a rotation and a rectilinear movement when the lower slider moves along the side sill, a door power connection portion provided between the lower slider and one end portion of the door arm, and a vehicle power connection portion provided at a position on the vehicle body corresponding to the door power connection portion and electrically connected to the door power connection portion by a rotation of the door arm.

What is claimed is: 
     
       1. A sliding door apparatus for a vehicle, the sliding door apparatus comprising:
 a door configured to open or close a door opening portion formed in a vehicle body; 
 a door arm including a first end portion rotatably connected to an end portion of the door, and a second end portion configured to be movable along a side sill of the vehicle body; 
 a lower slider coupled to the second end portion of the door arm and configured to be rectilinearly movable along the side sill of the vehicle body; 
 a lower arm plate connecting the second end portion of the door arm and the lower slider and configured to perform a rotation and a rectilinear movement when the lower slider moves along the side sill; 
 a door power connection portion electrically connected to the lower arm plate, extending through the door arm, and configured to transmit power required for the door; 
 a power plate provided in a movement route for the lower arm plate of the side sill and electrically connected to the door power connection portion; and 
 a vehicle power connection portion electrically connected to the power plate and configured to transmit power, which is required for the door, to the door power connection portion through the power plate. 
 
     
     
       2. The sliding door apparatus of  claim 1 ,
 wherein a plurality of first rollers rotatably coupled to the lower arm plate and is spaced from one another at predetermined intervals, and 
 wherein the first rollers are inserted into a plurality of rails provided on an upper surface of the side sill and move therealong. 
 
     
     
       3. The sliding door apparatus of  claim 2 ,
 wherein the first rollers include two rollers each including a first height, and two rollers each including a second height smaller than the first height, and the two rollers each including the first height and the two rollers each including the second height are alternately disposed, and 
 wherein the plurality of rails each has a depth corresponding to the height of each of the two rollers each including the first height and the two rollers each including the second height. 
 
     
     
       4. The sliding door apparatus of  claim 3 ,
 wherein each of the first rollers is coupled to a periphery of a roller shaft protruding on the lower arm plate, 
 wherein a roller electrode is provided in the roller shaft and is provided to penetrate the roller shaft in a direction perpendicular to the lower arm plate, 
 wherein an upper end portion of the roller electrode is in contact with the power plate to define electrical connection, and 
 wherein a lower end portion of the roller electrode is in contact with the door power connection portion to define electrical connection. 
 
     
     
       5. The sliding door apparatus of  claim 1 , wherein the door power connection portion and the vehicle power connection portion are each configured as an electric wire. 
     
     
       6. The sliding door apparatus of  claim 1 , wherein the power plate is configured as a copper (Cu) plate. 
     
     
       7. The sliding door apparatus of  claim 1 , wherein the door power connection portion is inserted into a groove provided in the lower arm plate and disposed in a longitudinal direction of the door arm. 
     
     
       8. The sliding door apparatus of  claim 4 , wherein the roller electrode is provided in the roller shaft to which a roller, which has the first height among the first rollers, is coupled. 
     
     
       9. The sliding door apparatus of  claim 1 , wherein the second end portion of the door arm, the lower slider, and the lower arm plate are connected by an arm pin in a direction perpendicular to the vehicle body, and the door arm and the lower arm plate are configured to rotate about the arm pin. 
     
     
       10. The sliding door apparatus of  claim 9 , wherein the second end portion of the door arm has two layers disposed in a vertical direction, and the lower slider is coupled between the two layers of the second end portion of the door arm by the arm pin. 
     
     
       11. The sliding door apparatus of  claim 10 , wherein the lower arm plate is rotatably coupled to an upper surface of the door arm by the arm pin. 
     
     
       12. The sliding door apparatus of  claim 1 , wherein the first end portion of the door arm is hingedly and rotatably connected to the door by a door pin. 
     
     
       13. The sliding door apparatus of  claim 12 , wherein a second roller is mounted on an upper surface of the door arm between the first end portion and the second end portion of the door arm so that the door arm moves along a route through which the door arm turns toward the outside of the vehicle body.